DWEL is a thematic collection focusing on the science, economics and policy issues of water. Resources in the collection are selected and rigorously reviewed by a diverse group of K-12 and informal science educators with an emphasis on high quality, exemplary digital resources that facilitate learning about all aspects of water in the Earth system in a wide range of learning environments. Many resources in the collection are in alignment with identified core water concepts in national and state science and geography education standards. The collection favors resources that are well-documented, easy to use, bug-free, motivational for learners, pedagogically effective, scientifically accurate, and which foster mastery of important scientific and mathematical understandings and technology skills.